private void SetChainPositions(VertexListMatrix chains, VertexIntDictionary chain_number, VertexIntDictionary pos_in_chain)
// Record chain number and position in chain of each vertex in chains
{
if (chain_number == null)
{
throw new ArgumentNullException("chain_number");
}
if (pos_in_chain == null)
{
throw new ArgumentNullException("pos_in_chain");
}
for (int i = 0; i < chains.RowCount; i++)
{
for (int j = 0; j < chains[i].Count; j++)
{
IVertex v = (IVertex)chains[i][j];
if (!chain_number.ContainsKey(v))
{
chain_number.Add(v, i);
}
if (!pos_in_chain.ContainsKey(v))
{
pos_in_chain.Add(v, j);
}
}
}
}